jwbot,
Here's the way it works where I live: if you can show you have lived independently for 2 yrs, and not on yr parents tax returns, you can be considered independent. Hope that's some help. Student Aid should be able to help you out with this.
As for yr dad's attitude, well, sometimes they know deep down in their hearts (?) that they are doin wrong by you, but can't admit it (thus the $$$ help, and the 'cold' attitude). I prefer to see it that way, it's more positive for me. But, help is help, so I don't question it too much, I can't read minds after all. If it's about manipulation, then I just keep aware, accept the financial help, say tks, and continue on.
just my 2 cents.
tal